Summary
Geochemical investigations have been carried out on the granites associated with the intragranitic wolframite vein type deposits of Xihuashan and Dangping (Jiangxi, China). The behaviour of major elements during evolution is identical to that of many evolved granites in orogenic provinces but trace elements and in particular REE indicate a complex magmatic and deuteric evolution. Partial melting or fractional crystallization fail to explain LREE and Eu depletions and HREE enrichments which are more likely due to volatile transfer. Sr isotopes give an age of 155±2 Ma and an initial ratio of 0.7169 excluding the involvement of wall-rock material in the generation of the granites. In addition they indicate that waters involved in the metasomatic and hydrothermal processes are not meteoric but rather magmatic. Suggestions for employment of the distinctive granite REE patterns for prospecting are given.
Zusammenfassung
Die Wolframgänge von Xihuashan and Dangping (Jiangxi, China) setzen in granitischen Gesteinen auf. Die geochemische Untersuchung der Granite läßt eine Evolution der Hauptelemente erkennen, die identisch mit der von Graniten in Orogen-Provinzen ist. Die Verteilung der Spurenelemente und besonders der SEE weist jedoch auf eine komplexe magmatische und deuterische Entwicklung hin. Partielle Aufschmelzung oder fraktionierte Kristallisation können die Verarmung an LSEE und Eu und die Anreicherung an HSEE nicht erklären; letztere sind eher auf Transport in volatiler Phase zurückzuführen. Geologische Untersuchungen ergeben auf der Basis von Strontium-Isotopen ein Alter von 155±2 Mio. Jahren und ein Initialverhältnis von 0,7169; dies schließt die Beteiligung von Nebengestein bei der Granitgenese aus. Darüber hinaus zeigen diese Ergebnisse, daß die für hydrothermale und metasomatische Prozesse verantwortlichen Wässer magmatischen Ursprungs sind. Bestimmte Verteilungsmuster der SEE in Graniten lassen sich als Hilfmittel bei der Prospektion verwenden.
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Le Bel, L., Yi-dou, L. & Ji-fou, S. Granitic evolution of the Xihuashan-Dangping (Jiangxi, China) Tungsten-Bearing system. TMPM Tschermaks Petr. Mitt. 33, 149–167 (1984). https://doi.org/10.1007/BF01081378
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DOI: https://doi.org/10.1007/BF01081378